It seems like the downloadable version is buggy/glitchy 😶 I’ve had no problems in the web version at least. Also multi shot might work but even if it did there are better upgrades like burst shot or attack speed in the game. Also the ice glitch seems to be mixed, sometimes it doesn’t work but for me ice has worked fine (besides when it glitches on some enemies and doesn’t work at all but thats a whole different story). Also accuracy ≠bullet speed, if you have max accuracy consider upgrading bullet speed to hit the red worms, or attack speed to fire more shots in general. TL:DR Every version seems to have its own bugs, the game is still in development after all